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<h1>Merging help files at run time
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<p>When you merge help files, information from the index and full-text search of multiple compiled help (.chm) files is combined at run time. A unified index and full-text search information appears in the Navigation pane of the Help Viewer.</P>

<p>To combine the tables of contents from multiple help files, you need to <a href="merge3.htm">link to the contents files</a> that need to be merged.</p>

<p>This is a very useful feature when you need to <a href="merge2.htm">merge multiple help files</a> that are designed as components of a larger help system. For example, the Professional edition of a software product might contain four programs, each with a separate help file; while the Student edition of the same product might contain only two programs and related help files.
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When a help author creates a project file that specifies which files to merge at run time, the help compiler will find and merge only those files on a user's computer. 
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<p>There are special considerations when <a href="linkmerge.htm">linking between merged help files</a>.</p>

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</td><td><a href="overlrg.htm">About managing large document sets</A>
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